Electronic – LTSpice Transconductance Amplifier Simulation

amplifierband passltspice

I'm trying to simulate a band-pass transconductance amplifier in LTSpice, which looks like this:

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I used the recommendations of this post – https://electronics.stackexchange.com/a/278870/87695 – and used a G component with a table to represent the voltage controlled current source in my LTSpice schematic.

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I have done some estimations on the locations of the poles and zeros:

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However, my simulation is not displaying the result I expect to see at all:

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I suspect that I set up the voltage controlled current source incorrectly. Here are the parameters:

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Any idea of what I did wrong? Thanks in advance.

Best Answer

Creating the current source with a table starting at 0V 0A probably clips your swing into the necessary negative direction, thus distorting the waveform and messing up the frequency response plot.

Giving it a wider range (-10V 1A, 10V 1A) gives it more headroom, but it could be clipping there too.

It might make more sense to use a BI source and simply set the current to a formula depending on the voltage of your node, this will not cause any clipping. I recommend though to label the net, as the n### automated node names can change.

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